@@ -452,7 +452,13 @@ static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
struct rt6_info *sibling, *next_sibling;
int route_choosen;
- route_choosen = get_hash_from_flowi6(fl6) % (match->rt6i_nsiblings + 1);
+ /* We might have already computed the hash for ICMPv6 errors. In such
+ * case it will always be non-zero. Otherwise now is the time to do it.
+ */
+ if (!fl6->mp_hash)
+ fl6->mp_hash = rt6_multipath_hash(fl6, NULL);
+
+ route_choosen = fl6->mp_hash % (match->rt6i_nsiblings + 1);
/* Don't change the route, if route_choosen == 0
* (siblings does not include ourself)
*/
Allow our callers to influence the choice of ECMP link by honoring the hash passed together with the flow info. This allows for special treatment of ICMP errors which we would like to route over the same path as the IPv6 datagram that triggered the error. Also go through rt6_multipath_hash(), in the usual case when we aren't dealing with an ICMP error, so that there is one central place where multipath hash is computed. Signed-off-by: Jakub Sitnicki <jkbs@redhat.com> --- net/ipv6/route.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)